Looks like something about the drive caddy or its drivers is interfering with the power down process. Is there any way you can test a different caddy?
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KaranMar 4 '13 at 1:29

@Karan Thank you for the response. I tested a different drive caddy and same issue, seems to be something with the drivers. I ended up just using the large of the 2 drivers and leaving out the second drive.
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WilliamNov 20 '13 at 23:20

1 Answer
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I has had a very similar problem with HP Elitebook 8460p, win7 prof. Quad core, for a long while. Today I had time to trouble shoot it. It is the caddy. My windows and HP drivers are regularly updated. I had used a 5200rpm 1TB Samsung drive earlier (at that time I suspected it may be the drive causing the problem) and several months ago I replaced that with a 7200rpm HGST drive but this issue remained the same (then I suspected it may be HP HW/Drivers). Today I found that if the 2nd drive is connected to eSATA (directly or still in caddy - I have both kind of cables) then no problems with hibernate/shutdown occur and if the Caddy is inserted in the bay, even empty caddy, then the problem comes back. While waiting in between reboots and searching on my other LT I found this post. I wish I had found it earlier. It might have saved me parts of my troubleshooting process. I hope it helps to others.